Sheep
Cysteine is required by sheep in order to produce wool: It is an essential amino acid that must be taken in as food from grass. As a consequence, during drought conditions, sheep stop producing wool; however, transgenic sheep that can make their own cysteine have been developed.
Read more about this topic: Cysteine
Famous quotes containing the word sheep:
“Behold, I send you forth as sheep in the midst of wolves: be ye therefore wise as serpents, and harmless as doves.”
—Bible: New Testament Matthew 10:16.
Jesus, sending forth the Apostles.
“I too have been in the underworld, as was Odysseus, and I will often be there again; not only sheep have I sacrificed so as to be able to speak with a few dead souls, but neither have I spared my own blood as well.”
—Friedrich Nietzsche (1844–1900)
“Which one of you, having a hundred sheep and losing one of them, does not leave the ninety-nine in the wilderness and go after the one that is lost until he finds it?”
—Bible: New Testament, Luke 15:4.